Fluid handling – Systems – With flow control means for branched passages
Patent
1988-10-12
1989-08-22
Michalsky, Gerald A.
Fluid handling
Systems
With flow control means for branched passages
60452, 13759612, F15B 1302
Patent
active
048586510
ABSTRACT:
A control valve for construction equipment adapted to operate a control mechanism in which a central by-pass passage is provided with a pilot pressure generating mechanism such as an orifice or the like and which is adapted to generate a pilot pressure due to pressure loss of fluid passed through the pilot pressure generating mechanism when a valve connected to the central by-pass passage is set at an open position, resulting the pilot pressure acting to control a discharge rate of a variable discharge pump. The control valve includes a valve body, in which a first spool and a second spool are arranged in series in such a manner that inner ends of the first and second spools are opposite to each other. An outer end of the second spool faces a second pilot chamber. A centering spring is arranged so as to act on an outer end of the first spool, so that the inner ends of both spools may be abutted against each other and received in a first pilot chamber when the spools are at their normal position. The application of a pilot pressure to the first pilot chamber causes the first spool to be moved against the centering spring to close the central bypass passage. Also, application of a pressure to the second pilot chamber causes both spools to be moved together to open a parallel passage.
REFERENCES:
patent: 3788077 (1974-01-01), Johnson et al.
Koiwai Hideshi
Sekikawa Keiji
Kayaba Industry Co. Ltd.
Michalsky Gerald A.
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